How to make a subframe for a Expedition truck. DIY step by step. 

I've watched this so many times. Just noticed I didn't comment. 😮 until now.😊 You basically brought the subframe up to the end of the truck chassis/ frame. With a little over hanging for the safety bumper/ bar.💪 How can one figure out a safe "extra" extension amount? 🤔 Does that make sense? Say if you wanted to extend the length of the habitat. Could you add 2ft, 3ft, 4ft, 5ft, past the end of the chassis frame? I know there is a limit but not sure how to figure it out. 🤔 📏 📐 ⚖️

Good subframe, man! Good job!!!

This is exactly what i needed to see at this stage of my build, thank you!

What an amazing job! Probably the best subframe design I have seen. Really looking forward to your video on buying / importing a truck. Can't wait to see more!

Excellent video, we have a truck already but are looking to build another with this exact sprung sub frame design - well explained & look forward to seeing it galvanized and fitted 😀👍

I think, as in I and Think?? I would have allowed more length for the 1/2" rod, be it 10.9 or Gr 8 yellow plated. Longer for being able to hold the end with channel locks to move the nuts. As well if the nylock part wears a jam nut can be used. In the fabrication stage, to use regular nuts . That is what I did.

Thanks a lot for beautifull help

I see so many over engineer theses. I respect the strength. Yet getting a design that is more tuned to right size is the goal. Some folks use heavy angle iron, to reduce weight. And to lower the height a bit inside the frame rails. The habitat floor frame, could be the cross members, not additional cross members, as a separate frame. You did a good job, I just think this could be done simpler.

Your subframe look substantial and well built, although heavy. Did you look at building a 4 point torsion-free subframe with rockers so that you could build a lightweight aluminum square tube subframe or a lighter weight steel subframe? On my Mercedes build I will be using a torsion free rocker style subframe for a couple reasons: I never want to get to a point off grid where if I had gone with the rail on rail spring subframe the terrain is going to cause the frame to twist/flex and have to turn back or risk damage. The other reason is after spending thousands of hours building out the habitat (camper) and lots of money have it get destroyed by a trail or terrain the is too much for the subframe and causes delamination of the composites, fracturing of wall, or leaking because of damage I cannot see within the walls or roof of the habitat. For me torsion free is added insurance against any risk of damaging my huge investment in time, sweat equity, and money as I am planning this for full time living.

It looks good what you are doing !!!!! As I am in about the same stadium as you are I'm very interested in what you're doing. I see that you made some extra arms (sidewards) to support the box later. My plan is to build the floor of the box with 7 hood-profiles. These are then welded to the the frame. It is about the same way of box as Rolling Home from Germany builded his one. In this way I think the box is self carrying. But maybe I also will make some extra arms on the corners. Greetings from NL , Frans

Hey Oscar, Great job on the sub frame, very informative. Did you follow the mercedes specifications ? I'm currently planning my build but specs says can't used rolled section not sure if i'm on the right track as i ws going to build something similar. cheers Poul

Can you expand on the reason of why the main rails of subframe had to have a v notch or angle cut in the front, thanks.

Could please explain why you have welded your crash bar to the subframe and bolted it to the chassis below. How can the subframe and chassis move independently when they are solidly joined at the rear? Am I missing something?

What paint you use to protect your steel frame from salt and rust? what method is the best to prevent rust?

Oscar, hallo! Please tell me, whu you not choise "4 point subframe torsion free" ? I thinj it will bi less weight than "classic subframe". You subframe is awsom, but i am just wundering Thank you

Can you tell me the specs of the springs that you used?

what is the specifications on the springs?